Propeller Technical Manual - Jabiru

Propeller Technical Manual
JPM0001-1
Jabiru Aircraft Pty Ltd
4A482U0D And 4A484E0D Propellers
4.7.4 Bench-Mount Pitch Setting
The following procedure is the recommended method used to set the blade pitch of propellers not equipped
with pitch lock pins. The setting Jig is shown in Figure 6.
1. Place the pitch setting jig on a flat, level surface. A special bench such as that shown in Figure 6
allows the assembly to sit level and the operator to adjust the 5/16” bolts without lifting it.
2. Fit the pitch setting plates to either end of the jig.
3. Using an accurate protractor, measure the angles of the pitch setting plates relative to the central
propeller mounting face. Ensure that both pitch set plates are at the same angle to the mounting
face: a difference here may indicate damage to the jig.
4. Assemble the hub halves and the blades, fitting only the outer ¼” bolts and tightening them evenly
until the nuts just touch the hub halves.
5. Place the propeller on the rig, taking care not to damage the blades against the pitch set plates.
Pieces of thin cardboard or rubber may be placed on the pitch plates to protect the blades.
6. Use the propeller drive pins to locate the propeller on the jig.
7. Fit the four 5/16” bolts through the propeller pins and the propeller & tighten until the nuts touch the
hub.
8. Remove any packing from between the blades and the pitch set plates. Use a 0.75mm (0.030”) steel
feeler gauge to check the gap between the pitch plate and the blades: this gap must be constant
from one end of the pitch set plate to the other.
9. Once the blade positions are set, tighten both the ¼” and 5/16” bolts to 5lb.ft.
10. Re-check the blades against the pitch set plates. It may be necessary to loosen the bolts and adjust
the blade position.
11. Acceptable limits for blade pitch are given in Section 4.1.2.
12. Set the ¼” clamping bolts to the torque specified in Section 4.1.1.
13. Remove the 5/16” bolts holding the propeller to the jig & remove the propeller.
WARNING
PROPELLER PITCH SETTING IS CRUCIAL FOR THE PERFORMANCE AND LONGEVITY OF THE
AIRCRAFT AND ENGINE.
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ISSUE 1 Dated : 1st Feb 2013 Issued By: DPS Page: 24 of 32
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